Cellular Network Infrastructure » Core Network (CN) » OsmoMSC

When the msc reboots all MS get implicitly detached. On the next CM SERVICE REQUEST the MS will get a CM SERVICE REJECT and by the cause code it knows that it has to perform a LOCATION UPDATE in order to get detached again. Unfortunately the cause code that the MSC returns with the CM SERVICE REJECT (GSM48_REJECT_MS_IDENTITY_NOT_DERVIVABLE = 9) is incorrect because this is a cause code from the GMM domain and is interpreted GSM48_REJECT_SRV_OPT_TMP_OUT_OF_ORDER by the MS, which also will not do any location update then.